Yes, they are transparent about deciding not to offer the user the choice in a straight-forward upfront way (i.e. opt in) because "the vast majority of users wi

Yes, they are transparent about deciding not to offer the user the choice in a straight-forward upfront way (i.e. opt in) because "the vast majority of users will not opt-in". In other words, deciding that what the users want is not as important as the marketing stats. And, as you say, users trust the developers with access to their systems and data. Deciding unilaterally to sacrifice user privacy to benefit other interests might be seen as a breach of that trust.